BMW E87 E90 CAS2 ECU Control Unit Module 61356964051 6943786

BMW E87 E90 CAS2 ECU Control Unit Module is an original component from the Electronic control modules and ECUs category, designed for the comfort and start authorization system in BMW 1 and 3 Series vehicles. This used CAS2 ECU allows for professional repair of the electronic system while maintaining the factory installation architecture and consistency with other vehicle systems.

Specifications and technical data

• SKU: 6943786
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 6943786
• Substitutable numbers: 6943786, 61356943786, 6943771, 61356943771, 6981416, 61356981416, 6943791, 61356943791, 6943775, 61356943775, 6943766, 61356943766, 6964051, 61356964051
• Category: ECUs & Computer Modules

Purpose and function of the CAS2 control unit

The CAS2 ECU module is responsible for advanced vehicle access management, key authorization, and communication with other control units within the vehicle network. In BMW E87 and E90 models, it plays a key role in engine start logic, immobilizer communication, and integration with the body electrical system. Using an original module from the same family ensures consistency of communication protocols and stable operation of the electronic system.

Benefits of using an original BMW module

Using a factory CAS2 ECU in a BMW E87/E90 ensures compatibility with the factory wiring harness, connectors, and CAN network architecture. This solution is particularly beneficial for:

• repairs following a comfort system failure or start-up issues,
• restoring vehicle configuration after electronic damage,
• professional diagnostics and service of security systems.

This minimizes the need for interference with the installation, which promotes high reliability and facilitates future maintenance. The original module from this series also offers greater system predictability compared to aftermarket replacements.

Condition, origin, and technical aspect

The offered control unit is a used part from vehicle dismantling, allowing for an economical yet technically sound vehicle repair. Such modules are frequently chosen by workshops specializing in the BMW brand, as they enable the maintenance of the original vehicle specification at optimal costs. Electronic control modules and ECUs in the OEM version are designed for long-term cooperation with other vehicle systems, which is important when operating in demanding conditions.

Selection by numbers and compatibility

When selecting a CAS2 ECU for a BMW E87 or E90, it is crucial to pay attention to manufacturer markings, part numbers, and interchangeable numbers to ensure full hardware and software compatibility. In workshop practice, identification by OEM number and reference numbers is often used, which facilitates matching the module to a specific vehicle configuration. If necessary, you can seek assistance from a specialized service center to verify the compatibility of the control unit with a specific car.

More about used electronics and ECU modules

If you want to better understand how to safely choose used control units, CAS modules, and other vehicle electronic components, how to check compatibility, and what to pay attention to during installation, it is worth checking out the practical guide by Global Parts: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?. This is a helpful source of knowledge for both end users and workshops.

If you are planning a comprehensive repair or upgrade of the body electronics area in your BMW and need other components from the same group, such as comfort controllers, body modules, or other ECU units, check the available parts in the BMW electronic control modules and ECUs category.